84005287 has 2 divisors, whose sum is σ = 84005288. Its totient is φ = 84005286.

The previous prime is 84005267. The next prime is 84005291. The reversal of 84005287 is 78250048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84005287 - 2¹⁵ = 83972519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84005267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42002643 + 42002644.

It is an arithmetic number, because the mean of its divisors is an integer number (42002644).

Almost surely, 2^84005287 is an apocalyptic number.

84005287 is a deficient number, since it is larger than the sum of its proper divisors (1).

84005287 is an equidigital number, since it uses as much as digits as its factorization.

84005287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 84005287 is about 9165.4398148698. The cubic root of 84005287 is about 437.9611020967.

The spelling of 84005287 in words is "eighty-four million, five thousand, two hundred eighty-seven".